main(List<String> args) {
  // 1.列表List
  var names = ['abc', 'cde', 'edf', 'abc'];
  names.add('fgh');

  // 2.集合Set
  var movies = {'dmkj', 'xjcy', 'lldq'};
  names = Set<String>.from(names).toList();
  print(names);

  // 3.集合Map
  var info = {"name": "lyc", "age": 20};
}
